Lissandra is arguably the weakest champion in LoL right now

This is my first ever thread, and I have played the game since Diana's introductory patch, and this issue was the one and only thing that drove me to actually write a thread about, so I guess you can see just how much the topic actually pushed me to write about this, which goes to show how dramatic I think this is. I tried Lissandra out a few days ago. Been playing her until now, and I cannot seem to be getting better at her. Learning curves are one thing but this is something completely different. It feels like I cannot progress with her at all. This META doesn't suit her at all, and Riot is doing absolutely nothing about it. Of course there are people that can utilize her to an extent, but I find that even they have difficulty in making her effective. I have seen a lot of Elsa of Garendel's Lissandra montages (which are super cool and you should check out). In fact, she's the one that pushed me to try her out, however I have also watched a couple of her game (not montage-cut) gameplays, and it was somewhat crucial for Lissandra to have a lucky start, relying on the enemies' mistakes, rather than her own skill. Her skills started shining only in teamfights, and that's where you could see her "lethality". But alas, even what she is supposed to COUNTER completely obliterated me (such as Zed or Talon). Her passive is an absolute wreck too, just a copy of Nunu's passive, who even Riot has announced will get a rework, due to how outdated his kit is. Lissandra doesn't have any reliable damage, and even ADCs cannot be burst down without help. She thrives in teamfights, I get that, but so do champions like Brand, whose laning phase is heaps better than that of Liss, and still serves the same function in teamfights, but much more safely and with a lot more impact. So why must there be such a champion difference. It's not even about playstyle, it really has something to do with how weak she is in all stages of the game. I cannot be comfortable parallellizing her to difficult champions such as Azir for example (although Azir is arguably in the same situation due to his innumerable nerfs, but I am focusing on his kit, which still rewards players in mid or late game). As the game progresses, you cannot say she becomes stronger, just less weak. It's hard even to kill the caster minions unless you get a Rabadon as your second item, which is not a great choice only because of the lack of durability. It's such a great shame too, because her kit (passive excluded) is so much fun, and the character itself is so beautiful and enigmatic. Her lore is compelling, intriguing and smart. I just wish her gameplay would match her background with just as much finesse and elegance. Riot SHOULD act to make her viable and definitely more played.